Core gate for bath-tub molds and the like



June 10, 1930. c. J. STEELE CORE GATE FOR BATH TUB MOLDS AND THE LIKE Filed April 5, 1928 2 Sheets-Sheet 1 INVENTOR C. J- STEELE ,4 TTORNEYS June 10, 1 930. 'c. J. STEELE 1,762,841

CORE GATE FOR BATH TUB MOLDS AND THE LIKE Filed April 5, 1928 2 Sheets-Shea; 2 4

mkvsuron '3 c. J. STEELE BY iITTORNEYS Patented Jane 10, 1930 LACE R. COATES AND CAIiIF-ORNIA eu'monenn, BOTH 013 Los 'ANGELEs,

' 001m GATE FOR'LBATH-TUB MoLns AND THELIVK'E Application fi1ed'April'5, 928 Seria'I No. 267,535.-

. invention is a core gate for bath tub molds and the like and the method of casting such articles.

. An object of my invention is the construction of a core gatewhich maybe fitted .ina sand mold fora bath tub or the like with the II I I "curved section 'of thetop, takenin the directhe rim portion of the'tub, whereby the cast iron of the tub may flow upwardly along the sides of the tub and across the bottom thus casting the, tub upside down. 1 Y

' A disadvantage in the former'proc'edure of casting bath tubs by flowing the cast iron to form the inverted bottom and this cast iron flowing down the sides of the mold and forming the rim at the extremity of the flow of the metal, is that in the downward flow of the hot iron it carries acertain amount of sand of the mold with it, thus forming'scourings and corrugations in the tub. With my method of casting the iron flows upwardly and does not tend to erode the sand of the mold, thereby giving a smooth casting. I

' An advantage of my "particular core gate and the procedureof using this with a sprue leading to the top of the mold is that the core'gate adjacent core gatemay be easily separated into two parts and thus readilyremove these two parts fromthe rim of the finished tub and break 7 off the sprue without any danger of breaking a part of the rim, which has been one of the difficulties the prior procedure of casting.

In my core gate construction this may be made of various shapes to fitdilferent styles of rims of bath tubs or similar articles; and the gates are formed in two parts which may be secured together by cementing when placed in the mold. These two parts then readily separate on the cemented line to effect removal of the finished casting from the sand mold by merely'tapping on one of the sections which is positioned on the'outside of the rim. The piece fitting in the rim is then easily removed without any danger of breaking the rim. I II My invention and its application is illustrated in the accompanying drawings, in'

which: 1

- Fig. 1 1s a transverse vertical section dicated by the linel-lof Fig. 2, I

I I horizontal section through a mold taken onth'e line 2'2 Fig. l'in the the section '11.

througha mold, the plane of'section being indirection of the arrows, I

Fig. 3 1s a bottom vlewof a core gatefor :1

tion "of the arrow 3 of Fig. 4:,

"taken the direction oft-he arrow 4 of Fig. 3,

I- ED sTATEs AT ENT" oFFIcE oAaMI 'J. s'rnnnnor 'LOS ANGEIJES, eA IFoRmA, Assreiton on dNE-THm-nmo WAL- ONE-THIRD To my Fig. 5 is across sectiontaken on the line I 5-5 of Fig.3,

Fig. 6 is a developed elevational view of the outside section of a core gate when separated I from the inner section as on the line 66 of F taken inthe direction of the arrows,

\ Fig. '7 is an under side view of a 'coreflgate adapted to form a rectangular cornered ar ticle such as wash tubs. II I I In the typefof' 'coregaterllustrated 1n Figs.

'3 through '6, I utilize "a main gate section 11 "which is illustrated as having a flat portion 12 which forms the top ofthe section.

There is also a curved bottom portion 13 and an outi ide surfacel l which is adaptd to fit against the side of the tub.-

'This section 1l hasfa surface, 15 which is joined to a removable section 16 ofthe gate. The section 16 of the gate has a flat top sur- "face 17 and a flat-bottom surface 18. Its outside surface 19 is illustrated as formed on a curve. This section also'has an inner face 20 which butts against theinner face 1 A pouring hole 21 is formed betweenthe at the top as indicated dotted in Fig 3. The hole is contracted in diameter as indicated by the measurement 22 at the bottom. '(Flgst'3 and I 12 and 17 of'the" two sections, this preferably being'circular" The longitudinal measurement 23 extends a considerable lengthof the core gate and that the curved section 13 of the main F portion 11 extends downwardly considerably below the surface 18 of the smaller-section. The rim of the tub is molded to meet the surface 18 and the slot 24 conforms substantially to the width of the metal in the mm of the tub.

The fitting of core gates as above described is shown particularly in Figs. 1 and 2, 1n which case the numeral 11 identifies the large or main section, and the numeral 16 the smaller section. The surfaces 12 and 17 are illustrated as facing upwardly in the fiask. A sprue 25 extends upwardly from the clrcular hole 21 to the top of the flaskand is connected to a pouring box 26.

In Figs. 1 and 2 the corner core gate 27 is merely a modification in design of the core gate shown in Figs. 3 through 6, but in this casethe slot 24 is shaped to follow the line 28 of the rim of the tub.

In F igs. 1 and 2 such top rim is designated by the numeral 29, this in the finished article being turned downwardly. The curved or molded part of the rim 30 forms the lowermost part of the tub while within the mold. The sides 31 extend upwardly and the bottom of the tub 32 is in the upper part of the flask.

In the construction shownin Fig. 7 I illustrate a bottom View of a core mold to form a rectangular corner, in whichcase the larger section 34 has a-curve 35 on the inner portion the outer section 36 has straight outer sides meeting at a right angular corner 37. In this case a circular hole 38 is formed at the top, this tapering to an elongated slot 39 at the bottom.

In the construction and use of my core gate the surfaces 15 of the large section and 20 of the small section are cemented together forming a unitary article which may be handled and placed in the molding flask so that the large section will fit in the molded part of the rim. I The sprue 25 is then-carried to the top of the flask, the lower end fitting in the circular hole 21. I find it satisfactory to utilize in the ordinary bath tub four core gates, using two at the sharp corners and two adjacent the curved end of the tub as illustrated in Fig. 2.

When the metal is poured into the pouring box it flows down the sprues 25, is then spread into thin I 1 streams Which flow through the eiongatec slots 24thereby first flowing into the rimport-ion of the tub. The metal then across what forms the rises in theside-portions of the tub and flows 7 bottom portion, although this is at the top part of the flask. he'metal spreads laterally, filling in the complete rim, sides and bottom, the metal one gate joining with that from another gate. In this action, as the metal flows upwardly in the sides of the tub it does not .e rodethe sand causing corrugations or the like, and having sand worked into the metal as in the prior practice.

VJ hen it is desired to remove the casting v from the mold it will be seen that the sprues are very readily separable from the core gates formed of suitable refractory material.

This allows removal of the outer section 16 and subsequently of the inner section 11, and the ready breaking of the small portion of metal in the slot portion of the core gate without any danger of cracking ormarring the rim of the finished tub or other article.

From the above description it will be apparent that many other shapes of core molds could be used, depending upon the articles to be cast and that these have the characteristic of a separable joint between two sections with the pouring gate formed in the line of the junction or a joint. The pouring gate, while it may be circular at the top to'conform to the sprues, or any other shape to conform thereto, is preferably elongated at the bottom following theedge or rim of the article being cast. 7

Various changes may be made in the principles of my invention Without departing from the spirit thereof, as set forth in the description, drawings and claims.

I claim:

1. In the art described the combination of a mold for a tub-like article having a rim forming portion arranged lowermost, a side wall forming portion extending upwardly therefrom and a bottom forming portion of the article at the top of the mold, a core gate connected to the rim portion, and a sprue connected to the core gate;

p 2. In the art described the combination of a mold for casting a tub-like article with a rim forming portion adjacent the bottom of a mold, the wall forming portion extending upwardly therefrom and a bottom forming portion adjacent the top of the mold, a core gate formed in two parts cemented together with an opening for pouring metal between the said parts, and a sprue connected to the core gate, the said parts of the gate being readily separable on opening of the mold.

3. In the art described the combination of a mold for casting a'tub-like article having a rim forming portion adjacent the bottom of the mold, a wall forming portion extending upwardly therefrom and a bottom forming portion adjacent the top of the mold, a core gate formed in two parts cemented together, one of said parts defining the curvature of the rim forming portion, there being an opening through the core gate adjacent the meeting faces of the said parts, and a sprue extending upwardly from said opening, the parts of the core gate being readily separable on opening of the mold.

4. In the art described the combination of a mold for casting tub-like articles with a rim forming portion adjacent the base of the mold, the bottom forming portion adjacent the top of the mold and the sidewall forming portion connecting the base and rim forming portions, a plurality of core gates through with a longitudinal slot at the hottom connecting to the outermost part of the rim, the said parts being cemented together, and a sprue extending uwardly from the said opening, the said parts being readily separable on opening of the mold.

5. A core gate foruse in casting tub-like articles, having a pair of parts cemented together with an opening through the adjoining faces of said parts to allow pouring of metal therethrough, the inlet end of said opening being shaped for the reception of a sprue, the said parts being readily separable on opening of the mold.

6. A core gate for use in casting tub-like articles having a pair of parts joined together by cement, there being an opening between the meeting faces of said parts terminating in a longitudinal slot at the bottom, said opening being adapted to accommodate a sprue extending upwardly from the top, and

the said parts being readily separable on opening of the mold.

7. A core gate for'use in casting tub-like articles having a pair of parts with the meeting faces connected by cement, there being an opening extending from the top to the bottom, said opening having an elongated slot at the bottom adapted to connect to a rim of an article being cast, said opening being adapted to be connected to asprue at the top, and said parts vbeing readily separable on opening of the mold.

8. A pouring gate comprising a body of refractory material and havingtherethrough a runner channel elongated at its outlet end into a slot.

49. A pouring gate comprising a body of refractory material having therethrough a runner channel elongated at its outlet end to a slot, said slot being curved to follow the contour of the article being cast.

12. A core gate comprising a body of refractory material, a portion thereof being shaped complementarilyto an interior portion'of the article being cast, and therebeing a runner channel disposed therethrough thus providing both a core and a pouring gate,

said runner channel being elongated at'it's outlet end to a slot.-

In testimony whereof I have signed my name to this specification.

CARMI J. STEELE.

10. A pouring gate compr sing abody of refractory material having therethrough a runner channel elongated at its outlet end to a slot, said slot being curved to follow the vcontour of the article being cast, and the inlet end of said slot being adapted to receive a sprue.

11. A core gate comprising a body of re- I fractory material, a portion thereof being shaped complementarily to an interior pur- 

